Not all shader nodes that work with Cycles work also with Eevee. The Geometry "Pointiness" socket doesn't, as well as the other "geometry-aware" nodes like Ambient Occlusion or Bevel.
Here is a reference about node support: https://docs.blender.org/manual/en/dev/render/eevee/materials/nodes_support.html
If your mesh isn't animated, you can bake Pointiness using Cycles and then use it in Eevee:
- Unwrap your mesh,
- connect the end of the Color Ramp to an Emission shader and the Emission Shader to the Material Output
- Add an Image Texture node and leave it unconnected, but selected
- Bake in "Emission" mode (while using Cycles)
- Save the baked image
- Use the baked image as a Texture for the Mix factor in Eevee